. >> when it comes to gun violence, fbi lists oak land as america's fourth most dangerous city. that's why they say it's ground zero for innovate i've proechs for reducing crime. they argue with a robust gun tracing system they'd have a strong tool for their arsenal. >> it's just a bunch of gunfire in the same areas over again. >> reporter: out on a saturday night. no longer an active gang member himself, he now tries to lower tensions between gang members. on this night he gets word of a shooting that may happen near international and 93rd. >> we come together to show the community that it's more serious than usual. a real young guy got killed. it was a homicide. a little 14 year old died. >> reporter: they are at the ground level of a pervasive problem in oakland. violence involving guns. we asked oakland police to provide data showing every time an officer confiscated a gun. from 2010 to 2012, more than 3700 weapons were seized by police. that's three guns a day. it's also 35% more than the number of guns seized in san francisco, a city with twice the population. we found in